<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>change按钮点击</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            margin-left: 100px;
            margin-top: 100px;
            margin-bottom: 10px;
        }
        button{
            margin-left: 125px;
        }
    </style>
    <script src="./click.js"></script>
</head>
<body>
    <div id="box"></div>
    <button id="btn-change">change</button>
</body>
</html>